<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Название</title>
        <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-+0n0xVW2eSR5OomGNYDnhzAbDsOXxcvSN1TPprVMTNDbiYZCxYbOOl7+AMvyTG2x" crossorigin="anonymous">
        <link rel="stylesheet" href="css/style.css">
    </head>

    <body>
        <nav class="navbar sticky-top navbar-expand-lg bg-dark navbar-dark">
            <div class="container">
                <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbar-dropdown" aria-controls="navbar-dropdown" aria-expanded="false" aria-label="Toggle navigation">
                    <span class="navbar-toggler-icon"></span>
                </button>
                <div class="collapse navbar-collapse" id="navbar-dropdown">
                    <ul class="navbar-nav">
                        <li class="nav-item"><a class="nav-link active" aria-current="page" href="#">Домой</a></li>
                        <li class="nav-item"><a class="nav-link" href="#">Контент</a></li>
                        <li class="nav-item dropdown">
                            <a class="nav-link dropdown-toggle" href="#" id="navbar-dropdown-menu" role="button" data-bs-toggle="dropdown" aria-expanded="false">
                                Список
                            </a>
                            <ul class="dropdown-menu dropdown-menu-dark" aria-labelledby="navbar-dropdown-menu">
                              <li><a class="dropdown-item" href="#group-1">Группа 1</a></li>
                              <li><a class="dropdown-item" href="#group-2">Группа 2</a></li>
                              <li><a class="dropdown-item" href="#group-3">Группа 3</a></li>
                              <li><a class="dropdown-item" href="#group-4">Группа 4</a></li>
                            </ul>
                        </li>
                    </ul>
                </div>
            </div>
        </nav>

        <section class="header-background">
            <header>
                <p class="text-center text-light header-text">Контент<br>Контент</p>
            </header>
            <section class="heading text-light">
                <div class="heading-grid-top container-fluid">
                    <div class="heading-grid-item"><h3>Контент</h3></div>
                    <div class="heading-grid-item"><h3>Контент</h3></div>
                    <div class="heading-grid-item"><h3>Контент</h3></div>
                </div>
                <div class="heading-header"><h1>Контент</h1></div>
                <div class="heading-grid-bottom container-fluid">
                    <div class="heading-grid-item"><h3>Контент</h3></div>
                    <div class="heading-grid-item"><h3>Контент</h3></div>
                    <div class="heading-grid-item"><h3>Контент</h3></div>
                </div>
            </section>
        </section>

        <main id="main-group">
            <h1 class="text-center text-light">Контент</h1>
            <section id="group-1">
                <h2 class="text-center text-light">Группа 1</h2>
                <div class="main-grid container">
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                </div>
            </section>

            <!-- group 2 -->
            <section id="group-2">
                <h2 class="text-center text-light">Группа 2</h2>
                <div class="main-grid container">
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                </div>
            </section>

            <!-- group 3 -->
            <section id="group-3">
                <h2 class="text-center text-light">Группа 3</h2>
                <div class="main-grid container">
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                </div>
            </section>

            <!-- group 4 -->
            <section id="group-4">
                <h2 class="text-center text-light">Группа 4</h2>
                <div class="main-grid container">
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                    <div class="main-grid-item">
                        <div class="card text-center bg-transparent text-light" style="width: 18rem;">
                            <img class="card-img-top" src="" alt="Картинка">
                            <div class="card-body">
                                <h5 class="card-title">Контент</h5>
                                <p class="card-text">Контент</p>
                                <a href="#" class="btn btn-primary">Кнопка</a><br><br>
                                <a href="#" class="btn btn-primary">Кнопка</a>
                            </div>
                        </div>
                    </div>
                </div>
            </section>
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